Warp stop mechanism for looms



' Nav. 16, i926. 1,607,057

E. A. cuNNlFF WAR? STOP MECHANISVM FOR LOOMS Filed April 23, 1926 P. SheeQs-Sheei -2 TTORNEY Patented Nov. 16, 1926.

lsmsreal) n, CUNNIFF, OFWALTHAM," Mssseonusnrrs, Assrenon To Dal-inne conronnzrron,` on HVOPEDALE, Massacnosnrmsa consonancia oF MAINE'.

WARP sToPJMEcHAn-SM FOR Loomsr n,

explication filed Aprirzaieee.- semaine. 104,191.

This invention Yrelates to Warp stop mechanisms for looms and is more particularly directed to causing loom stoplpaofewon thel occurrence of a hitch-back or adraw in 5 the VWarp threads, p t Y It'is now the ordinary practice to ,provide looms .with :Warp stop mechanisins. which effect loom stoppage onthe occurrence oa Warp fault', such, for instance, asbreali# age, or undue .slackness otonefof the Warp threads and, it has. heretotore' been stigv nested tti-provide means for stoppingthe loom upon the4 occurrence of e a .hitch-leachA or draw in the warp threads. rIfhe term cthitch-lo-ack or ",drawv signies a condition ofthe; Warp threads Vwhereby they are stuckj together or Vcrossed as they pass from the warploeam towards the Weaving'instrurnentalities.` I n vmost cases-Where the Warp 'for la Vvloornl has lloeen carefully prepared, little or no diiiicult7 occurs'by reason of draws or vhitch-l)acks, but in seine cases where the Warps have not received proper;y attention during theirpreparation, vthey are. liahleto v'hec-ome stuck together by reason .of VthesizeV orl finishing compound,J and' *ifl such- Qondition is not reniedied,`fanltswill occur;` in the inishedfabric. n f In accordance. with the present invention, vthe'Warp)stop mechanism may embody'the usual series of .drop Wiresv which lare nor-V Ifnally` supportedgby the vWarpV threads" during Weavingv and on occurrence of abreakf age of ay Warp thread or"toofslack-Warp, thread, vineans are set in action for effecting loom stoppage. Y In connection with this general Warp stop: mechanisrn the present invention contemplates the utilization of a series of hitch-back drop Wires Whi'c'hniayvbe of the same general construction as the ordinary drop Wires but which., zu'nlirlnV `the Warp,

' drop wires, are not` supportedby the Warp Yention, the vhiteh-baclrdrop angela esta@ stop :the loom.

on .the occurrence of: a draw may `yield r'ontwardly to allow the connected hitchbaek drop wire to moire into position yto` The inventionand-new combination off parts `will best he inade Vclear from the fol"-` lowing .description andthe accompanying drawingswofvone good forni thereof.

In, the drawings:

F ,1 isY Va perspective vView of a leoni ,d

proyidedwith a .WarpV :stop mechanism con tainingthe present invention; r'and Fig.2 is a fore and. aft section of a loom containingthepresent invention;

AThe Vloorn trarne 1 inay of any usual construction and has mounted upon the rear portion thereof the l'Warp beam 2 `which may be conveniently supported in hearings Y 3 carried hy the'loorn; frame. The usual', crank shat tothe lay 6, anda vthe 'sheddingV mechanisin 7,1nay all be of usual construction, andl since suchp'artsare nowfwell understood, further description thereof appears unnec' essary- -shaft 4,"thepitman 5, connectingthe, crank 'i Theithreads a are vtaken :trom ythe Warp hearn @andere passed frontwardly of.' the looin throughtthe,shedding:,mechanism to l, the, take-up, asi-7'; usual, and `in theirrconrs'e trontwardly thefW'ar'pLth-reads Ypass over the parts, also, rnay be of usual construction. l

n' Mounted uponthe -looifnr trarne` are vthe* side supports .11one each side of the, loorn, and on the side supports Il thernain portions of the Warp stoprmechanism ,may

Stillenor bolt l."

#Thesis spannen, bearings 15. e ydetector .shaft Y16 tof-Which is secured i7, Saai;

Chien v filete. time @am Qj-'O'ljljftlie lower The' :treieefg nahe-lise arin" 13' to which it Anclainped v,by a seti -Whip Kroll 8 "carriedfby the'szide arins 9ex. vtending froinfthe ,rockY ,shaft 10,'5The'se Y 85,

@essere as shown, is of the general type now well known.

are lmounted the usual lease rods 2d over and under which the warp threads a pass, as indicated in Fig. 2.

The warp stop mechanism in the present invention comprises a series of warp drop wires 25 which rare normally supported by the warp threads during weaving, and in the present instance of the invention, two sets 'of such warp drop wires are shown, but itjis to he understood that any. suitahlenumher of rows may he employed. c

The warp drop wires 25 have elongated slots 26 through which pass the drop wire guides 27, the construction heing such that the up and down movement of the warp drop wires may he vproperly directed so that on the occurrence of a. breakage or too slack warp thread, the associated drop wire will move downwardly into the path of the drop wire detector 17, arrest its movement and cause loom stoppage, as usual. v

ln accordance with the present invention, the warp stop mechanism Vhas associated with itia series of hitch-hack? drop wires associated @hitch-hack drop wire'to moveV which are normally supported Vtrom an extrav lease rod yieldingly held towards the rear of the loom, but which on the occurrence of a draw in the warpV threads, permits the Y into stopping `relationwith thedetector.

o plied to the loom of usual construction, toA

As before indicated, warp draws7 vare not vusually present 1n well prepared Vwarps and so it is not necessary that every loom contain a hitch-hach dropwire device forr stopping the looin'on the occurrence of 'a draw but where the .warp `Ythreads Vhave been carelessly prepared Aor fromV any other v cause they should stick together, a hitch-hack device of the present invention may he readily apf stop its operation on the occurrence of a draw7 inthe warp. Mounted upon the sidejsupports l1 and extending upwardly therefrom are the arms or uprights 28 which may be adjustahly secured to the side supports ll by bolts 29 which pass through slots 30 in the foot portion of the uprights 28. Extending between the arms'or uprights 28 is a rod 3l which is disposed above the tops of the drop wires.

rlhe hitch-back drop wires 32 may be formed substantially the same as .the warp drop wires, as indicated in Fig. 2, but Vsince the @hitch-hack dropL ,wiresk arel not supported directly by the warp threads, they need not he provided ,jwithY warp receiving eyes. Thev hitch-back 'drop wires 32ers provided with elongated slots 33 through In the present instance hack drop wires 32,v as indicated in Fig. l, Y

onefof such hitch-loaclrfa drop wires being at vthe opposite end of the series of warp drop wires and kanother hitch-hack drop wirelintermediate the ends.

Back of the warp stop mechanism,v as indicated in Figs. l and2, there is an eXtra lease rod 34 which is connected to the hitchhack drop wires hy flexible connections 35 which pass over the transverse rod 3l and maywhevconveniently secured to the upper end portion kof the associated hitch-hack7 drop wire, as'clearly indicated in F ig. 2.

The lease -rod 34C is normally under the inuence of springs which serve to hold it in rearward position with permissive frontward yieldingmovementeither asa whole or at one end, the construction being such that the springs may individually yield in accordancevwith the location of theA .draw torpermit the hitch-hack drop wire to moveto its operative position relativeto the detector'. o c As indicated more clearly in Fig. l, the

lease rod 34 is under the influence oit springs 36' lllllally acting to Ymove the lease. rod rearwardly and perforcev lift the hitchloaclr,` dropwires into their upper inopera` tive position, as indicated in Fig. l.' lt' is usually desirable to have the samenumher of-springsr36 acting upon thelease rod 34 as there are hitch-hack drop wires, 'and when a draw occurs, say adjacent one end of the lease rod, that end may he moved' frontwardly under the yielding iniiuence of the adjacent spring. and at such time the lease rod will turn it about the opposite end spring as afulcrum, Each Vof the springs 36 is connected, at one end,.asI at 37, to the lease rod 34 and at its opposite end to the rod or l assembling with fthe' .warp stop mechanism theruprghtarmsiS; tansvers 'lid 31' the extra lease rod 34, springs 36 and flexibly connected hitch-back drop wires.

Vhat is claimed is: y

l. In a warp stop mechanism for looms, the combination of a series of warp drop wires normally supported by the warp thread during weaving, a plurality oit hitch-back drop wires each having an elongated slot, a drop wire guide passing through the slots in the hitch-back drop wires, an upstanding arm at each end ofthe series of drop wires, a support extending between said arms above the tops ot the dropwires, a lease rod, a flexible connection between the lease rod and each of the hitch-back drop wires passing over the said support and normally acting to maintain the upper ends of the hitch-back drop wires above the upper ends ot the series of warp drop Wires that la draw in the warp may be indicated by the lowered hitch-back drop wire as the cause of loom stoppage.

2. In a'warp stop mechanism for looms, the combina-tion of a series of warp drop wires normally supported by the warp threads during weaving, a hitch-back drop wire at each'end of the series, a hitch-back drop wire intermediate the ends of the series, a guide rod supported above the tops of the drop wires, a lease rod, a 'flexible connection between each hitch-back drop wire and lease Vrod passingover the guide rod, a

spring connected at each end of the lease rod and a spring intermediate the ends of the lease rod normally acting to support c the hitch-back drop wires with their upper ends above the tops of the warp drop wires but individually yielding on the occurrence of a draw in the warp lto indicate by the disappearance of the hitch-back drop wire the cause of loom stoppage, a drop wire guide, and a detector adapted to be arrested in its movement to effectloom stoppage by any unsupported drop wire.

3. In a warp stop mechanism for looms, the combination of a seriesof warp drop wires, a plurality of hitch-back drop wires, a lease rod, springs for holding the lease rod rearwardly, side supports, an upstanding larin mounted on each support, a guide rod extending between said arms above the tops of the drop wires, flexible connections between the lease rod and each of the hitchback drop wires passing over the guide rod above the drop wires and normally maintaining the tops of the hitch-back drop wires above the tops of the warp drop wires that the cause of loom stoppage may be inf ditated on the occurrence of a draw in the warp.

4. In a warp stop mechanism for looms, the combination of side supports, a series of warp drop wires, a hitch-back drop wire at each endof the series and a hitch-back drop wire between the ends of the series, a

guide rod extending between the side sup.

ports above the drop wires, a lease rod, flex ible connections between the lease rod and eachl of the hitch-back drop wires passing over the guide rod, a spring acting upon the lease rod at each end and at an intermediate y point to normally support the hitch-back drop wires with their tops above the tops of the series of vwarp drop wiresl and individually yielding on the occurrence'of a drawv y in the warp to lower the hitch-back drop wire and locate the draw, and a detector adapted to be arrested to effect loom stoppage by any one of the hitch-back drop wires. n

5. In a warp stop mechanism for looms,

thecombination of side supports, a series of warp drop wires, a hitcheback drop wire at each end of the series and a hitch-back drop wire between the ends of the series, a drop wire guide extending between the side supports and passing through the hitchback drop wires, a guide rod extending between the side supports above the drop l vidually yieldable on the occurrence of a Y draw in the warp to locate thedraw, Vand a detector adapted to be arrested to elect loomy stoppage by any one of the hitch-back drop wires. f v Y In testimony whereof, I vhave signed my name to this specification. l

EDWARD A.' CUNNIFF. 

